I sort of wish players could only choose one job.

[Mishaela]

Well, I'd like to hear why other player do, or don't like the multiple job mechanic. While I appreciate it's functionality toward online dynamics, it's the novelty that I feel takes away from the Final Fantasy atmosphere.

One of the biggest advantages of being able to play as multiple jobs on a single character is that a player is encourage by the game to play one character. They are encouraged by the game to be a character in the game world and not merely a role. It's a key immersion point. This in turn strengthens the attachment to your character and feeling of familiarity in the game's world and community as others do the same and you see familiar faces when you log in. Additionally, the time investment that goes into a character with multiple jobs leveled can serve as an motivation to keep one's reputation good, which is good for the community. People will know you by name, and you can build up trust and relationships based on WHO you are not WHAT you are.

Most FF games have always been about the characters first and how they can adapt to a situation (via jobs or other gameplay mechanics) to overcome challenges.

Ultimately, alts undermine the sense of attachment and coherence to the game world by making it more difficult to get attached to a character, not to mention complicating things like friends lists, guild membership, and so-on.